TW202017247A - Antenna structure and wireless communication device using the same - Google Patents

Abstract

An antenna structure is applied to a wireless communication device. The wireless communication device includes at least one electronic component. The antenna structure includes a metal frame. At least one substrate is positioned on the metal frame. An antenna is disposed on the at least one substrate. The antenna includes a feed portion and a gap. The feed portion cross the gap. A distance is between the metal frame and the electronic component to form a clearance area of the antenna structure. A wireless communication device is also provided.

Description

Antenna structure and wireless communication device with the antenna structure

The invention relates to an antenna structure and a wireless communication device with the antenna structure.

With the advancement of wireless communication technology, consumers have increasingly higher requirements for the bandwidth of wireless communication products. The current products mainly use the metal frame at the upper and lower ends of the product as the antenna. The metal frame is divided into several sections by setting multiple interruption points on the metal frame, which are used to implement antennas with different functions, for example, 4G, Global Positioning System (Global Positioning) System, GPS), and wireless local area network (Wireless Local Area Network, WLAN).

5G communication can add new communication frequency bands, but the original antenna space is already crowded. If you add a 5G antenna to the original antenna space, it may affect the performance of the original antenna and reduce the flexibility of antenna design.

In view of this, it is necessary to provide an antenna structure and a wireless communication device having the antenna structure.

An embodiment of the present invention provides an antenna structure applied to a wireless communication device. The wireless communication device includes at least one electronic component. The antenna structure includes at least a metal frame. At least one substrate is laid on the metal frame. An antenna is formed on a substrate. The antenna includes a feed-in portion and a slot. The feed-in portion spans the gap. There is a gap between the metal frame and the electronic component to form a clear area of the antenna structure.

An embodiment of the present invention provides a wireless communication device including the antenna structure.

The above antenna structure and the wireless communication device with the antenna structure can add a 5G sub-6 GHz antenna or a Wi-Fi antenna while maintaining the original antenna performance to increase the transmission bandwidth.

The technical solutions in the embodiments of the present invention will be described clearly and completely in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without making creative efforts fall within the protection scope of the present invention.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field of the present invention. The terminology used in the description of the present invention herein is for the purpose of describing specific embodiments, and is not intended to limit the present invention.

The following describes some embodiments of the present invention in detail with reference to the accompanying drawings. In the case of no conflict, the following embodiments and the features in the embodiments can be combined with each other.

Please refer to FIGS. 1 and 2. The antenna structure 100 according to the preferred embodiment of the present invention is used in a wireless communication device 200 for transmitting and receiving radio waves to transmit and exchange wireless signals. The wireless communication device 200 may be a wireless communication device such as a mobile phone, a personal digital assistant, or a tablet computer.

The wireless communication device 200 at least includes a housing 11. The casing 11 may be a casing of the wireless communication device 200. The casing 11 includes at least a back cover 12 and a metal frame 13. In this embodiment, the back cover 12 is made of non-metallic material, such as plastic, glass, or ceramic. The metal frame 13 is made of a metal material, and the metal frame 13 may be an outer frame of the wireless communication device 200. The back cover 12 and the metal frame 13 constitute a housing of the wireless communication device 200. The wireless communication device 200 further includes a display screen 10. In this embodiment, the display screen 10 may be a touch-type display screen, which may be used to provide an interactive interface to implement user interaction with the wireless communication device 200. The display screen 10 and the back cover 12 are disposed substantially in parallel.

Please refer to FIG. 3 and FIG. 4 together, the metal frame 13 has a substantially ring structure. In this embodiment, the metal frame 13 and the back cover 12 form an accommodating space 14. The accommodating space 14 is used for accommodating the electronic components 15 such as the battery 101 and the motherboard 102 of the wireless communication device 200 and the circuit modules such as the processing unit.

In this embodiment, there is a gap between the battery 101 and the side wall of the metal frame 13, which is used as the clearance area 103 of the antenna structure 100. The host board 102 may be a PCB (Printed Circuit Board, printed circuit board).

In this embodiment, the metal frame 13 includes at least a first side portion 131, a second side portion 132, a third side portion 133, and a fourth side portion 134 that are sequentially connected. In this embodiment, the first side portion 131 is opposite to the third side portion 133. The second side portion 132 is opposite to the fourth side portion 134. The second side portion 132 connects the first side portion 131 and the third side portion 133, and is preferably connected vertically. The fourth side 134 also connects the first side 131 and the third side 133, preferably vertically. In this embodiment, the second side portion 132 is defined as the top end of the wireless communication device 200. The fourth side portion 134 is defined as the bottom end of the wireless communication device 200.

In this embodiment, the metal frame 13 includes a first surface 141, a second surface 142, and a third surface 143. The first surface 141 and the second surface 142 are oppositely arranged. That is, the first side portion 131, the second side portion 132, the third side portion 133, and the fourth side portion 134 all include the first surface 141, the second surface 142, and the The third side 143. The third surface 143 is connected between the first surface 141 and the second surface 142. Specifically, the first surface 141 is vertically connected to the third surface 143, the second surface 142 is also vertically connected to the third surface 143, and the first surface 141 is parallel to the second surface 142 Interval setting. It can be understood that, in other embodiments, the third surface 143 may be non-vertically connected to the first surface 141 and the second surface 142.

In this embodiment, the first surface 141 faces the back cover 12. The second surface 142 faces the display screen 10. The third surface 143 faces the inside of the metal frame 13, that is, toward the battery 101.

In this embodiment, at least one substrate 20 is laid on the metal frame 13. The substrate 20 may be a flexible printed circuit (Flexible Printed Circuit, FPC). In this embodiment, the substrate 20 may be made entirely of metal material or partially made of metal material. The substrate 20 is laid on the electronic component 15 and the metal frame 13. In this embodiment, the substrate 20 is laid on the battery 101 and the metal frame 13. One side of the substrate 20 is laid on the battery 101, and the other side of the substrate 20 is laid on the metal frame 13, that is, the substrate 20 is laid above the clearance area 103.

Please refer to FIGS. 5 and 6 together. In this embodiment, the metal frame 13 may be provided with at least one slot 130. The slot 130 is elongated. The number of the slots 130 is the same as the number of the substrate 20, and the slots 130 are opened under the substrate 20. The slot 130 is used to expand the clearance area 103. The space between the battery 101 and the third surface 143 of the metal frame 13 serves as a clearance area 103 of the antenna structure 100. The slot 130 is a part of the clearance area 103. There are no conductors or electronic components in the clearance area 103. It can be understood that when the distance between the third surface 143 and the battery 101 is sufficiently large, the slot 130 may not be formed on the metal frame 13.

It can be understood that, in this embodiment, the at least one slot 130 may be formed on the metal frame 13 by a CNC (Computer Numerical Control, CNC) machining method. It can be understood that, in other embodiments, the metal frame 13 may be cut by other processing methods such as laser cutting technology, so that the at least one slot 130 is formed on the metal frame 13.

In this embodiment, the substrate 20 includes a first surface 21 and a second surface 22 disposed opposite to the first surface 21. The first surface 21 and the first surface 141 are located on the same plane. The first surface 21 faces the back cover 12. The second surface 22 faces away from the first surface 141 and toward the second surface 142 and the display screen 10.

In other embodiments, the substrate 20 may be disposed at other positions of the metal frame 13. For example, the first surface 21 and the second surface 142 are located on the same plane. The first surface 21 faces the display screen 10. The second surface 22 faces away from the second face 142 and toward the first face 141 and the back cover 12.

An antenna 30 is correspondingly opened on the at least one substrate 20. In this embodiment, two metal substrates 20 are laid on the metal frame 13. One substrate 20 is laid on the first side 131 and the battery 101, and the other substrate 20 is laid on the third side 133 and the battery 101. Correspondingly, the two substrates 20 are respectively provided with a first antenna A1 and a second antenna A2. The first antenna A1 and the second antenna A2 have the same structure. The first antenna A1 and the second antenna A2 are oppositely arranged. The first antenna A1 and the second antenna A2 may form a multiple-input multiple-output (Multiple-Input Multiple-Output, MIMO) antenna, for example, to provide a 2x2 multiple-input multiple-output.

It can be understood that, in other embodiments, the two substrates 20 are not limited to the above configuration, and they may also be laid on the first side 131, the second side 132, the third side 133, and the fourth side 134 On one side or multiple sides. That is, the antenna 30 may not be provided on each of the first side 131, the second side 132, the third side 133, and the fourth side 134, and one or more antennas 30 may be provided.

It can be understood that the number of substrates 20 laid on the metal frame 13 is not limited to two, and may be one or any number. Correspondingly, the number of the antenna 30 is not limited to two, and may be one or any number.

In this embodiment, the structure of the antenna 30 will be described by taking one of the antennas 30, for example, the first antenna A1 as an example.

Each antenna 30 includes a slot 31 and a feeding portion 32. The slit 31 and the feeding portion 32 are both elongated structures. The slit 31 is opened on the substrate 20. The slit 31 penetrates the first surface 21 and the second surface 22. The feeding portion 32 is disposed on the first surface 21 and crosses the gap 31. It can be understood that the length L1 of the slit 31 is smaller than the length L of the substrate 20. The width D1 of the slit 31 is smaller than the width D2 of the substrate 20. The length L1 of the slit 31 and the length L of the substrate 20 are both measured along the first side portion 131 where the slit 31 and the substrate 20 are located. The width D1 of the slit 31 and the width D2 of the substrate 20 are both measured along the first side portion 131 perpendicular to the slit 31 and the substrate 20.

The substrate 20 may be all-metal, or a layer of metal may be provided around the gap 31. The gap 31 may or may not be filled with insulating material. The feeding part 32 may be a wire, which may be realized by a metal segment on the FPC.

In this embodiment, each of the antennas 30 further includes at least one switch 33, two ends of the switch 33 are respectively connected to the two sides of the slot 31, and the switch 33 is used to adjust the slot 31 To adjust the resonant frequency band of the antenna structure 100. When the switch 33 is turned off, the switch 33 does not affect the length L1 of the slit 31. When the switch 33 is turned on, the switch 33 can shorten the length L1 of the slot 31 to adjust the resonance frequency band of the antenna structure 100. When the change-over switch 33 is turned on, the slit 31 is divided into two sections by the change-over switch 33. At this time, the length of the slit 31 is shortened to the length L2 of the section including the feed-in portion 32. It can be understood that L2 is smaller than L1, that is, the length L2 of the slit 31 when the switch 33 is turned on is smaller than the length L1 of the slit 31 when the switch 33 is turned off.

Each of the antennas 30 is a slot antenna. After the current is fed from the feeding part 32, the current will be coupled to the slot 31, so that the slot 31 can excite the first resonance mode and the second resonance mode under the action of the switch 33 To generate radiation signals in the first frequency band and the second frequency band, respectively. Specifically, when the switch 33 is turned on, the length of the slot 31 is L2. After the current is fed from the feeding part 32, the current will be coupled to the slot 31, so that the slot 31 excites the The first resonance mode to generate the radiation signal in the first frequency band. When the switch 33 is turned off, the length of the slot 31 is L1. After the current is fed from the feeding part 32, the current will be coupled to the slot 31, so that the slot 31 excites the second The resonant mode generates the radiation signal in the second frequency band.

In this embodiment, both the first resonance mode and the second resonance mode are 5G sub-6 GHz modes. The frequency of the second frequency band is lower than the frequency of the first frequency band. The first frequency band is a 4.8-5.0 GHz frequency band, and the second frequency band is a 3.3-3.6 GHz frequency band.

In other embodiments, the first resonance mode and the second resonance mode may be Wi-Fi modes. The first frequency band may be a Wi-Fi 5GHz frequency band, and the second frequency band may be a Wi-Fi 2.4GHz frequency band.

It can be understood that when each of the antennas 30 includes N of the switching switches 33, by controlling the turning on and off of the N of the switching switches 33, there can be N+1 changes in the length L1 of the slit 31, Therefore, the antenna structure 100 can cover N+1 resonance frequency bands. N is any positive integer. After the current is fed from the feeding part 32, the current will be coupled to the slot 31, so that the slot 31 can excite N+1 resonance modes under the action of the N switching switches 33 to Generate radiation signals in N+1 frequency bands.

FIG. 7 is a graph of the total radiation efficiency of the antenna structure 100. Wherein, curve S601 is the total radiation efficiency of the first antenna A1 when working in the 3.5 GHz frequency band. Curve S602 is the total radiation efficiency of the first antenna A1 when operating in the 5 GHz frequency band. Curve S603 is the total radiation efficiency of the second antenna A2 when operating in the 3.5 GHz frequency band. Curve S604 is the total radiation efficiency of the second antenna A2 when operating in the 5 GHz frequency band.

It can be clearly seen that the total radiation efficiency of the first antenna A1 operating in the 3.5 GHz frequency band and the total radiation efficiency of the second antenna A2 operating in the 3.5 GHz frequency band substantially coincide, and the first antenna A1 operates The total radiation efficiency in the 5 GHz frequency band and the total radiation efficiency when the second antenna A2 works in the 5 GHz frequency band substantially overlap. It can be understood that the total radiation efficiency of the plurality of antennas 30 disposed on opposite sides of the metal frame 13 when operating in the same frequency band is approximately the same.

As described in the previous embodiments, the antenna structure 100 is provided with at least one substrate 20 on the metal frame 13. Each antenna 30 includes a slot 31, a feeding portion 32, and at least one switch 33. The slit 31 penetrates the first surface 21 of the substrate 20 and the second surface 22 of the substrate 20. The feeding part 32 crosses the gap 31 and feeds current into the gap 31 in a coupled manner, so that the gap 31 excites the first resonance mode and the second resonance under the action of the switch 33 Modal to generate radiated signals in 3.3~3.6GHz frequency band and 4.8~5.0GHz frequency band. One or more sides of the first side 131, the second side 132, the third side 133, and the fourth side 134 of the metal frame 13 may be used for setting the substrate 20, and the remaining sides may be used for Install original antennas such as 4G, global positioning system (GPS), and wireless local area network (WLAN). Therefore, while maintaining the performance of the original antenna, the wireless communication device 200 can add a 5G sub-6 GHz antenna or a Wi-Fi antenna to increase the transmission bandwidth.

In summary, this creation meets the requirements of the invention patent, and the patent application is filed in accordance with the law. However, the above are only the preferred embodiments of this creation, and the scope of this creation is not limited to the above embodiments. For those who are familiar with the skills of this case, the equivalent modifications or changes made by the spirit of this creation are all It should be covered by the following patent applications.

100: antenna structure 200: wireless communication device 11: Shell 12: back cover 13: Metal frame 10: Display 14: accommodating space 101: battery 102: motherboard 103: Clearance area 15: Electronic components 131: First side 132: Second side 133: Third side 134: Fourth side 141: The first side 142: Second side 143: The third side 130: Slotted 20: substrate 21: The first surface 22: Second surface 30: antenna A1: The first antenna A2: Second antenna 31: Gap 32: Feeding Department 33: Toggle switch

FIG. 1 is a schematic diagram of an antenna structure applied to a wireless communication device according to a preferred embodiment of the present invention. 2 is an exploded view of the wireless communication device shown in FIG. FIG. 3 is a schematic diagram of the antenna structure shown in FIG. 2. FIG. 4 is a partially enlarged view of the antenna structure shown in FIG. 3. FIG. 5 is a schematic diagram of the metal frame of the antenna structure shown in FIG. 3. FIG. 6 is a cross-sectional view of the wireless communication device shown in FIG. 7 is a graph of the total radiation efficiency of the antenna structure shown in FIG. 3.

no

13: Metal frame

14: accommodating space

101: battery

102: motherboard

103: Clearance area

15: Electronic components

131: First side

132: Second side

133: Third side

134: Fourth side

141: The first side

142: Second side

143: The third side

20: substrate

30: antenna

A1: The first antenna

A2: Second antenna

Claims (12)

An antenna structure is applied to a wireless communication device. The wireless communication device includes at least one electronic component. The improvement is that the antenna structure includes at least a metal frame on which at least one substrate is laid, and the at least one substrate An antenna is formed on the antenna. The antenna includes a feed-in portion and a slot. The feed-in portion spans the gap. There is a gap between the metal frame and the electronic component to form a clear area of the antenna structure. The antenna structure according to item 1 of the patent application scope, wherein the at least one substrate is laid on the electronic component and the metal frame. The antenna structure according to item 1 of the patent application scope, wherein the substrate includes a first surface and a second surface opposite to the first surface, and the slit penetrates the first surface and the second surface . The antenna structure according to item 3 of the patent application scope, wherein the antenna further includes at least one switch, two ends of the switch are respectively connected to both sides of the slot, and the switch is used to adjust the slot To adjust the resonant frequency band of the antenna structure. The antenna structure as claimed in item 4 of the patent application range, wherein when the switch is closed, the switch does not affect the length of the slot, when the switch is turned on, the slot is switched by the switch Divided into two sections, the length of the slit is shortened to the length of the section containing the feed-in portion. The antenna structure as described in item 5 of the patent application range, wherein the feeding portion is provided on the first surface and crosses the gap, and when a current is fed from the feeding portion, the current is coupled to the gap , The length of the slot is shortened when the switch is turned on, so that the slot excites a first resonance mode to generate a radiation signal in the first frequency band, and the length of the slot does not change when the switch is closed, The second resonance mode is excited by the gap to generate a radiation signal in a second frequency band, and the frequency of the second frequency band is lower than the frequency of the first frequency band. The antenna structure according to item 3 of the patent application scope, wherein the metal frame further includes a first surface, a second surface and a third surface, the third surface is connected to the first surface and the second surface Between, the first surface is vertically connected to the third surface, the second surface is perpendicularly connected to the third surface, and the first surface and the third surface are arranged in parallel and spaced apart, the first Three sides face the inside of the metal frame. The antenna structure according to item 7 of the patent application scope, wherein the first surface and the first surface are located on the same plane, and the second surface faces away from the first surface and toward the second surface. The antenna structure according to item 7 of the patent application scope, wherein the first surface and the second surface are located on the same plane, and the second surface faces away from the second surface and toward the first surface. The antenna structure as described in item 1 of the patent application scope, wherein the metal frame is provided with a slot for expanding the clearance area. A wireless communication device including the antenna structure according to any one of patent applications 1-10. The wireless communication device according to item 11 of the patent application scope, wherein the wireless communication device further includes a back cover and a display screen, the first side of the metal frame faces the back cover, and the second side of the metal frame Towards the display screen.

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